[oilpan] Completely move HTMLFormControlElement's hierarchy to the managed heap

Source/core/html/ValidationMessage.h

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 14 matching lines @@
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef ValidationMessage_h
 #define ValidationMessage_h
 
 #include "core/platform/Timer.h"
+#include "heap/Handle.h"
 #include <wtf/Noncopyable.h>
 #include <wtf/OwnPtr.h>
 #include <wtf/RefPtr.h>
 #include <wtf/text/WTFString.h>
 
 namespace WebCore {
 
 class HTMLElement;
 class HTMLFormControlElement;
 class Node;
 class ValidationMessageClient;
 
 // FIXME: We should remove the code for !validationMessageClient() when all
 // ports supporting interactive validation switch to ValidationMessageClient.
 class ValidationMessage {
     WTF_MAKE_NONCOPYABLE(ValidationMessage); WTF_MAKE_FAST_ALLOCATED;
 public:
-    static PassOwnPtr<ValidationMessage> create(HTMLFormControlElement*);
+    static PassOwnPtr<ValidationMessage> create(Handle<HTMLFormControlElement>);
     ~ValidationMessage();
     void updateValidationMessage(const String&);
     void requestToHideMessage();
     bool isVisible() const;
     bool shadowTreeContains(Node*) const;
 
 private:
-    ValidationMessage(HTMLFormControlElement*);
+    ValidationMessage(Handle<HTMLFormControlElement>);
     ValidationMessageClient* validationMessageClient() const;
     void setMessage(const String&);
     void setMessageDOMAndStartTimer(Timer<ValidationMessage>* = 0);
     void buildBubbleTree(Timer<ValidationMessage>*);
     void deleteBubbleTree(Timer<ValidationMessage>* = 0);
 
+    // FIXME(oilpan): Use a weak handle.
     HTMLFormControlElement* m_element;
     String m_message;
     OwnPtr<Timer<ValidationMessage> > m_timer;
     RefPtr<HTMLElement> m_bubble;
     RefPtr<HTMLElement> m_messageHeading;
     RefPtr<HTMLElement> m_messageBody;
 };
 
 } // namespace WebCore
 
 #endif // ValidationMessage_h